public static IMessage Deserialize(ref byte[] Raw)
{
var Stream = new DnStream(ref Raw);
var Message = new Message
{
ID = Stream.GetUShort(),
MessageType = Stream.GetBit().AsEnum <MessageType>(),
OperationCode = Stream.GetBits(4).AsEnum <OperationCode>(),
AuthoritativeAnswer = Stream.GetBit().AsEnum <AuthoritativeAnswer>(),
Truncated = Stream.GetBit().AsBool(),
RecursionDesired = Stream.GetBit().AsBool(),
RecursionAvailable = Stream.GetBit().AsBool(),
Zero = Stream.GetBit(),
AuthenticatedData = Stream.GetBit().AsBool(),
CheckingDisabled = Stream.GetBit().AsBool(),
ResponseCode = Stream.GetBits(4).AsEnum <ResponseCode>(),
QuestionsCount = Stream.GetUShort(),
AnswersCount = Stream.GetUShort(),
AuthorityCount = Stream.GetUShort(),
AdditionalCount = Stream.GetUShort()
};
Message.Questions = GetQuestions(ref Stream, Message.QuestionsCount);
Message.Answers = GetAnswers(ref Stream, Message.AnswersCount);
return(Message);
}
private static IEnumerable <string> GetLabels(ref DnStream Stream)
{
var Labels = new List <string>();
while (true)
{
var LabelType = Stream.GetBits(2).AsEnum <LabelType>();
switch (LabelType)
{
case LabelType.Normal:
{
var Length = Stream.GetBits(6);
if (Length == 0)
{
return(Labels);
}
var Label = Stream.GetString(Length);
Labels.Add(Label);
break;
}
case LabelType.Compressed:
{
var Pointer = (ushort)(Stream.GetBits(6) + Stream.GetByte());
if (Pointer >= Stream.BytePosition - 2)
{
throw new ArgumentOutOfRangeException(nameof(Pointer), Pointer, "Compressed Label Infinite Loop Detected.");
}
var Position = Stream.BytePosition;
Stream.Seek(Pointer);
Labels.AddRange(GetLabels(ref Stream));
Stream.Seek(Position);
return(Labels);
}
default:
throw new ArgumentOutOfRangeException(nameof(LabelType), LabelType, null);
}
}
}
